Compatible Models

The Bosch CO2139B 3/16 In. X 3-1/2 In. Cobalt M42 Drill Bit is the correct replacement for the following model numbers.

Description

Cobalt bits with upgraded M42 alloy for long life in hard metalSurface hardened with web-helix design and high heat resistanceDrills stainless steel, cast iron, titanium, other hard metals

Benefits
Cobalt M42 drill bit
provides upgraded M42 cobalt jobber-length bits designed for durability, high heat resistance and hardened surface for stainless steel, cast iron, titanium, light-gauge metal and aluminum
Enhanced M42 alloy material
contains 8% cobalt alloy that delivers 10X life vs. standard bits
Three-flat shank on bits 3/16 In. and larger
deliver better bit grip
High-heat resistant bits
withstand high-temperature applications for extended periods of time
Thick web-helix design
provides additional stability in tough applications
Surface-hardened tip
penetrates tough abrasive materials
Split points on bits 1/8 In. and larger
allow for easy starts with no skating, eliminating the need for a center punch

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